View: https://youtu.be/-bJR63FXjqo
This video mentions several songs that had samples of "Numbers Stations" used in them, there were many of these back in the 1960's, 70's & 80's transmitting on shortwave, coded messages to spies & Embassies around the world, they were unbreakeable codes, the most famous being The Liconlnshire Poacher & Swedish Rhapsody, named after the tune played before the main transmission, most spooky at the time hearing these things at night